Telescoping inside gauge and indicator



l W. vI/ITIIIER. TELESCOPING INSIDE GAUGE ANDV INDICATOR. l APPLICATIONFILED DECIZZ, |921.

IIALMW Imm@ UCI. w, w22.

Patented @et 1W, 1222.

` antan waaraan wrrrnnn, or7 transex emv, new annata.

TELJESCOPING INSIDE GAUGE AN 1D KNJDICATUM..

application led December 22, 1921. aerial Ito. Mamba.

following is a specification.

ject the desired distance This invention relates to a telescoping gauge,having a test indicator attachment, adapted for takinginsidemeasurements.

The object of my invention is to provide an instrument for convenientltaking exact inside measurements of cylinders, holes,

slots, key ways and-other openings, or between walls of structures, andfor showing inequalities in opposed surfaces.

A special object is to immediately show variations in dimensions at theexterior of a deep or long opening into which the measuring part of theinstrument is inserted.

The matter constituting my invention will be defined in the claims.

ll will now describe the-details of construction of my improved gauge byreference to the accompanying drawings, in which:

Figure 1 represents kan elevation of the instrument, with parts insection, in position in a cylinder to begaged.

Fig. 2 represents a sectional elevation of an extension plunger.

Fig. 3 represents a top plan View of a detail.

The telescoping inside gauge 1 is constructed with a tubular casev orsocket 1, havin a lower curved head or knob 1b and a colglar or enlargedportion 1c at the top provided with an internally screw threaded socket1d, which is also externally. screw threaded at k for receiving thehandle 5. rllhe telescopin extension plunger 2 is made holllow and o -adiameter-to slide freely in the holder socket 1, and of a length toprobeyond the upper end of part 1a, as shown in Fig 1. `The plunger 2has a longitudinal groove or slot 2a to'form a guide way for a screw le;and a rounded contact knob 2U. Within the hollow of the plunger 2 isplaced a helical spring adapted to extend beyond the open end when notcompressed, as shown in .F ig. 2. The plunger and spring are seated 1nthe case la. Upon the plunger is secured a collar 3, having an adjustingthumb screw 3 and a beveled contact lug 3h, havin a beveled under tacea. The elongated ho low handle 5v has a screw threaded inner end Itadapted to ento engage the socket 1d" and at its lower end a knurledhead 5a. This knurled head has a longitudinal threaded opening g and ishollowed at its inner end toY tit loosely and turn upon a reducedportion of the handle 5. Within the handle 5 is mounted a rod f engagingat its outer end with the threaded opening g, and having a screwthreadedinner end f which passes through the threaded opening of socket1d, so as to bear at its inner end upon the plunger 2, as shown in Fig..1, and hold said plunger in a fixed position, or serve for.

releasing the same after the instrument has been inserted in a hole orbore of a cylinder. Mounted upon the handle 5 are two guide way collars6, secured b upward extensions provided with openings e. The push rod 7is provided at its inner end with a contact knob b and at its outer endwith a knob al, and near the middle with a colla-r cas a bearing for acoiled sprin 8, Which bears at its opposite end on the co lar 6. Thespring acts to lightly 'push the rod against the beveled face ot' lug3b. The knob d of rod 7 is in position to make contact with a contactpin 11 in an indicator.

lin connection with this gauge I preferably use my test indicator 10,which may be mounted in any convenient position on the handle 5, andpreferably by means .of a post 111 secured by a collar 14a on thehandle. llo the post is secured'a holder bar 15 on the indicator. andknob 11 working in a tubular stem and connecting with the interior levermechanism for operating the pointer 13, which is adapted to traverse thegraduated scale on the arc 12. The test indicator 10 is the subject of aseparate application for patent, and is adapted tov show variations indimensions of a thousandth of an inch or less.

The operation or manipulation of the device will be readily understoodby those skilled in metal working arts. It may be Yused for taking theexact size ot' shrink, close or loose fits varying in thousandths of aninch or less; these variations can be made and'measured. 4To measure ahole or interior of a c linder the instrument may be used as fol ows:Compress the telescoping plunger and lock it by a slight turn of thehead 5, insert the case and plunger inside the hole or cylinder,

as illustrated in Fig. 1, then set the indicator pointer at zero,release screws and having the lbck or rod f and then slide in from frontto back of the opening, then swing the han- -dle up and down and theindicator will show any variations in dimensions and Whether the hole orbore is straight, also the size of the hole or bore. The spring 4 willpress the extension lunger against the surface of the hole an permitdepression, carrying With it the collar and beveled contact lu 3b,Which,bearing on the push rod 7, Wil transmit movement to the contactpin l1 and thus to the pointer arm 13, which Will show the variations onthe scale in 'thousandths of an inch.

The gauge may-be made from one and a hair inches to six inches or moreand With a handle up to nine inches long; it can be used either forshort or long holes or key Wa s.

lillariations in details of construction mayl of said rod for showingvariations in dimensions of inside surfaces.

2. The combination with a casing socket, an extension plunger. andspring therein, of a collar having a beveled lug on said plunger, anelongated handle engaging with said c:1sing socket, a push rod mountedon the handle and adapted to make contact with said beveled lug, and atest indicator positioned to make contact with the outer end of said rod'for taking inside measurements.

3. The combination with a casing socket and an extension plun er andspring therein, of an elongated han( e engaging with theJ socket member,collars fixed on the handle, and provided with openings, a springpressedpush rod in the opening of said collars and having contact ends, :ibeveled lug on said plunger and adapted to bear on the inner end of saidrod, and a test indicator mounted on the outer end of said handle andhaving a contact pin in )osition to make contact with the outer en ofsaid rod for taking inside measurements in a hole or si key Way.

n testimony whereof l aiix my signature in presence of two Witnesses.

WILLAM Wl' "lNER Witnesses:

i CHAS. W. BRUGER,

RICHARD GABmELsKY.

